Colored-cement product and process of producing the same.



, HENRY A. GARDNER,

OF WASHINGTON, DISTRICT OF COLUMBIA.

COLORED-CEMENT PRODUCT AND PROCESS O1 PRODUCING THE SAME.

No Drawing.-

Tu all whom it may concern Be it known thatl, I'IENRY A. GARDNER, a citizen of theUnited States, residing at 'ashington, in the District of Columbia, have invented certain new and useful Im provemcnts in Colored-Cement Products and Processes of Producing the Same,'ot which the following is a specification.

My invention relates to a method of producing colored cement or concrete articles or products.

Portland cement and similar cementitious materials are, for the most part, of a gray ish tint and concrete made up of such mate rials has the same color. To produce col ored articles of these materials, it has been proposed to add coloring matter, but such additions are limited to the use of a small number of pigments such as iron oxid or ocher with which only a few limited weak colored effects can be produced; the use of most chemical colors for this purpose being impracticable on account of their sensitiveness to the caustic action of the basic lime compounds which are liberated when the cement sets.

I have discovered a method of treating Portland cement and. thelike by which pcr-' p brilliance.

manent and brilliant color eti'ects' can be obtained.

My process consists in adding to tll cen mortar, at .the time of mixing, a paste, made up of a mineral or color, ground. in an organic pro- ,tance of an nuszwoniliable nature, such hydrocarbon or petroleum oils. Coloring materials suitabl tor my purpose are metallic oxids, mcia nhromates, and sili'cious earths, such when umber and sienna, while color ialres precipitated upon a color base, such as barytes. aluminum hydrate, etc, represent the class of suitable organic colors which are well adapted for use in this method. Of the latter class of colors, the paianitranilin and toluidin reds are of special value.

In the Jreparationof the color addition, I grind the pigment .in the protective substance to a smooth paste 0 suitable consistency.

As an example of my process,

the follownon-hydrous paste Serial No. 749,248.

ing is given :-I grind together in a mortar, mill, or other apparatus, equal parts of neutral petroleum oil and chromium oxid green until a smooth paste of suitable consistency is produced. Twenty parts of-the resulting paste is added to one hundred parts of Portland cement, previously mixed with two hundred parts of sharp sand. Sufficient water is added and the materials worked together "until an evenly colored mass "is produced, which is then ready for placement.

be molded into various forms for producing art objects or may be used as a stucco for walls and ceilings or for laying cement floors or any other analogous purpose. The thus colored constructions, upon hardening, have a permanent color and possessa high degree of impermeability and resistance to surface disintegration. The non-'saponifiable nature of the protective substance which is ground with the color before the latter is broughtinto presence of water inhibits any action on the pigments by the caustic lime compounds developed by setting cement, even when such pigments are of chemical origin. For instance, the red oXids of iron may be used without danger of material darkening in shade or of diminution of their 1. The method of coloring ccmentitious materials such Portland cement or the like which consists in mixing therewith a non'l' drous paste containing a pigment and an unsaponiliable protective vehicle.

2. The method of coloring cementitious materials such as Portland cement and the like which consists in mixing therewith a non-hydrous paste containing apigment and an unsaponifiable oil.

3. The method of coloringfcementitious naterials such as Portland cement and the like which consists in mixing therewith a an unsaponifiable hydrocarbon oil.

4. A colored cement article comprising a body of cementitious material such as Portland cement and the like having mixed therewith a pigment and an unsaponifiable material sprring to protect said pigment.

5. A colored cement article comprising :1

containing a pigment and lpecmcation of Letters Patent. Patented J 16 1914. Application filed February 1811913.

It may body of cementitious material such as Porthydrocarlmn oil serving to protect said pig- Iand cen'lent and the like having mixed therement.

with a pigment and an unsaponifiable oil In testimony whereof I affix my signature serving to protect said pigment. in presence of two witnesses.

6.. A colored. cement article comprising a I HENRY A. GARDNER. body of cementit-ious material such as Port- \Vitnesses: land Cei'uent and the like having mixed 0. W. FOWLER,

therewith a pigment; and an unsaponifiable J. H. BRIOKENSTEIN. 

